Show "Credit Cost" instead of $ Price

Issue Summary

Am I understanding the proper use of this module:

I have set up a product that upon purchasing grants the user x store credits.

I then have other products that I want to assign a store credit price to.

I would like for the price displayed for the product to reflect the number of credits required to purchase the product without a price being set for the product. As it is now, I have to enter a price for the product, which negates the use of store credit.

I would like to use store credit as the sole means of paying for a product.

Any suggestions?